新一代SDH/SONET技术

从SDH/SONET光传输网的现状出发,分别对SDH/SONET ADMs的发展趋势、Data over SDH、RPR over SDH及GMPLS-SDH技术等作了介绍。     

Effects of Channel Interchange and Route Splitting on Ring Loading Efficiency

We address two questions related to the design and management of ring-based networks and the choice of add–drop multiplexer (ADM) technology. One issue is the benefit of a channel interchange capability in the ADMs of SONET or WDM rings. Although counterintuitive, we show that there is essentially no benefit from this potentially expensive capability if the selection of demands for ring loading is optimally planned for each case. This knowledge can help prioritize standards-making and equipment development efforts. A second question relates to provisioning demands over more than one route through a ring. Administration and provisioning is simplified by prescribing a single route per origin–destination pair, but in a ring-based network there is an as yet unquantified penalty to enforcing this operational policy rather than allowing splitting of routes within rings. To assess the benefits of channel interchange and route splitting, together and individually, we solve the respective integer programming formulation to find the optimal revenue or transport efficiency loading solutions. Conclusions are based on comparing efficiency and revenue metrics on a large number of randomized trials with different ring sizes, demand patterns, and line capacities. Results show that while channel interchange has negligible beneficial effect, route splitting can provide significant revenue or efficiency benefits.     

PDH到622Mb/sSDH/SONET映射芯片实现

 设计了PDH到622 Mb/s SDH/SONET的映射及逆映射芯片.集成了DS1/E1/J1成帧器、DS1/DS3复接电路和E1/E3复接电路,具有622 Mb/s和155 Mb/s的高速标准接口和3通道STM-1/STS-3分插复用总线接口,支持复用段1+1保护和UPSR环形网络拓扑结构.单片实现84通道DS1/J1或63通道E1到STM-1/STS-3的映射复用功能及多通道DS3/E3/STS-1到STM-4/STS-12的映射复用功能.支持点对点应用和环形应用,交换模式支持2016通道DS0/E0的应用.4颗芯片实现336通道DS1/J1或252通道E1到STM-4/STS-12的映射复用功能.采用TSMC 0.13 μm CMOS工艺流片,芯片规模约600万门,700管脚 PGBA封装,满足光纤通信传输的要求,并成功用于光纤通信设备.     

Computing theK-terminal reliability for SONET self-healing rings

Synchronous Optical Network(SONET) technology has made highspeed self-healing ring(SHR) architectures practical and economical for the uses in many local exchange carriers‘ intra local access transport area telecommunication networks.This paper analyses the K-terminal reliability.i.e.,the probability that a subset of k specific terminal stations of an SONET SHR can communicate,for four types of SONET SHRs and derives their K-terminal teliability expressions.     

SDH/SON ET互通解决方案

本文从国际传送网建设的必要性、SDH/SONET的区别及其转换方案等进行论述,并以实际应用案例加以说明。     

2.5Gb/s SDH/SONET通路终结芯片设计

设计了一种2.5Gb/s同步光纤网络SDH/SONET中通路终结处理器芯片.采用双向4路总线流水线结构,77.76MHz的系统时钟,可实时处理2.5Gb/s的SDH/SONET数据,终结处理后输出TUG-3/VTG信号.包括通道告警、信号失效检测、性能监测和通道跟踪等.支持STS-48/STM-16、4路STS-12/STM-4和4路STS-3/STM-1的处理.     

一种光纤通信系统可用性的算法及分析

本文对SDH光纤通信系统的可用性建立了一种新的数学模型,提出了系统可用性的一种算法, 并且应用数学方法求出一个具体系统的可用性,同时分析和讨论了系统可用性同相关参数的关系以及提高系统可用性的方法.     

下一代网络技术--IP over DWDM浅谈

本文就当前IP传输发展的趋势，介绍了IP over DWDM技术的特点及在其上承载IP业务几种解决方案。     

未来公用网络中的光互连网

介绍一种应用于未来公用网络中的光互连网 ,它采用 IP over DWDM技术 ,通过 ATM和SONET层的消除降低了成本和管理复杂性。文中首先介绍 IP over DWDM方案 ,然后介绍 IP overDWDM的支持技术—— DWDM的发展状况和因特网业务特征。并介绍 SONET层消除出现的问题及解决方法 ,以及所带来的支路分离的成本节约。最后展望了 IP over DWDM技术的应用前景。     

Ethernet-over-SONET(EoS) over WDM in Optical Wide-Area Networks (WANs): Benefits and Challenges

Ethernet has been playing an increasingly important role in wide area networks (WANs), from both a service perspective and a transport-technology perspective. Unlike its dominant presence in local area networks (LANs), Ethernet in WANs has been increasing its popularity in three different directions, i.e., Ethernet-based layer-2 virtual private network (L2VPN) over layer-3 network, Ethernet over SONET (EoS), and Ethernet directly over WDM channels or optical fibers. In this paper, we investigate the benefits and challenges of using next-generation SONET/SDH techniques—namely SONET/SDH virtual concatenation (VCAT) and link-capacity adjustment scheme (LCAS)—to support Ethernet-based data services in intelligent optical WDM wide area networks. In particular, we evaluate the network performance improvement after employing VCAT. In order to fully utilize VCATs inverse-multiplexing capability, several simple and effective heuristic algorithms are proposed and evaluated.*Part of the work was accomplished while Keyao Zhu was a Ph.D. student in the Networks Research Lab. at University of California, Davis, under the supervision of Professor Biswanath Mukherjee. Summarized versions of this paper were presented at the IEEE/OSA Optical Fiber Communication Conferences OFC03 and OFC04 in Atlanta, GA, in March 2003 and in Los Angeles, CA, in March 2004, respectively.Corresponding author